ADS8694IDBT

Analog To Digital Converters (ADC) Overview

The ADS8694IDBT is an 18-bit, 500-kSPS single-supply SAR ADC data acquisition system featuring four channels. It integrates an analog front-end with a programmable multiplexer and a low-drift 4.096-V internal reference. The device supports software-programmable bipolar input ranges (±2.56 V to ±10.24 V) and unipolar ranges (0 V to 5.12 V or 10.24 V). It operates on a 5-V analog supply and a 1.65-V to 5.25-V digital I/O supply. Key electrical parameters include a DNL of ±0.6 LSB, INL of ±1.75 LSB, SNR of 92.5 dB, and THD of -110 dB. It features a constant resistive input impedance ≥1 MΩ and overvoltage protection up to ±20 V.

Analog To Digital Converters (ADC) Feature Summary

• Integrated 18-bit SAR ADC with analog front-end and programmable multiplexer
• Software-programmable bipolar and unipolar input ranges with constant resistive input impedance
• SPI-compatible MultiSPI interface supporting daisy-chain connections
• On-chip low-drift 4.096-V voltage reference

Analog To Digital Converters (ADC) Applications

• High-precision industrial process control systems
• Power quality monitoring equipment
• Data acquisition modules for PLCs
• Medical instrumentation requiring high resolution

Analog To Digital Converters (ADC) Procurement Notes

Verify the package type matches the required PCB footprint, as the IDBT suffix indicates a 38-TSSOP package. Confirm the operating temperature range meets the application's environmental requirements, specifically the extended industrial range from -40°C to +125°C. Ensure the design accounts for the specific power supply requirements of 5 V for analog and 1.65 V to 5.25 V for digital interfaces. Check for RoHS compliance status if restricted substances are a concern in the target market.

Analog To Digital Converters (ADC) Selection Notes

Select this component when 18-bit resolution and 500 kSPS throughput are required for multi-channel applications. It is suitable for designs needing integrated signal conditioning, such as built-in overvoltage protection and programmable gain. Consider the ADS8698 if eight channels are needed instead of four. Evaluate the power consumption constraints, as the device draws significant current during conversion cycles. Ensure the host microcontroller supports the SPI timing requirements for reliable data transfer.

Analog To Digital Converters (ADC) Part Context

The ADS8694IDBT belongs to the Texas Instruments ADS869x family of 18-bit SAR ADCs. This series includes variants like the ADS8698 (8-channel) and other speed grades such as the ADS8691 (1 MSPS) and ADS8699 (100 kSPS). These devices share a common architecture focused on high accuracy and integrated analog front-ends for industrial data acquisition. The IDBT suffix specifically denotes the tape-and-reel packaging format within the TSSOP-38 housing.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS8698IDBT serves as a direct functional substitute for designs requiring eight channels instead of four. For lower speed requirements, the ADS8699IDBT offers reduced power consumption at 100 kSPS. Higher performance needs may be met by the ADS8691IDBT, which provides 1 MSPS throughput. All these alternatives maintain the same 18-bit resolution and pinout compatibility within the ADS869x family.